Malicious PDF — malware analysis report

Static analysis result for SHA-256 4517bf0e540a6740…

MALICIOUS

PDF

87.8 KB Created: 2021-06-26 00:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9346353e1884dae88fa9028d87d3e686 SHA-1: d4d44733f37da5110800f5c3666cba2a78583508 SHA-256: 4517bf0e540a67403283176c3f09bab79d2cddb9b209d149b8fbb3607b4507a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=meaning+of+alkaline
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be3bb1e00d---48749676053.pdf
    • http://lezeckastenakosice.sk/upload/files/19516463863.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ed5d3e435---96460618768.pdf
    • http://ceomit.com/fckupload/file/tifunidanekewizevitum.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f2c4b62887b1d951f591dbeda4af7ede/gugifanegotapusoxuvi.pdf
    • https://eternalbliss.net/file/japufadebalodukigiwexige.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f73f9b7bf6---jufobojubus.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/6a9sfdrtnq1earf91r6fecokcp/pozigifepenas.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607866412d26d---9605099131.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e7e642b9a30152d9ce2fe287e4e88dbc/vigakepugedapitize.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b3375ac97e912ab5df765f20f6897dfa/jerof.pdf
    • http://sparan-art.ru/ckfinder/userfiles/files/82715314048.pdf
    • http://manavpublicschool.org/manav/userfiles/file/80595439623.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5f64cfcec---xonezufabemaxeg.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/385t0rqb67t1hvnv9ibaedmrr7/22029644176.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a59d3bc58c5---mojeguk.pdf
    • http://brandnewgoods.net/userfiles/file/89775327841.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/1135993e0b2a7a93b8d20ce2e4399672/busomozediva.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078578777588---88496968291.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711dd0cf1fc---zenodolonexafemopunogab.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/nti23h7s82bfcebf538onatjrj/geregedaved.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160718b11e3d04---54963926263.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/4c3af1a2399fc900b5071d5601476a08/refadijidovofigowawixum.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/58198cc0e7918d5362e32b92edb0d79e/kevojuluwununaxurezaso.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965a495bc45---47119172817.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011d32.bin
25353075712496e542f6029f7143905ff235ad4f34f33dcf1ccd23fb2bb514e8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11D32 17572 bytes
font_00_sfnt_off0000c646.bin
8323993563e344bfd93050edc07295add2369d38ceca4ce4b8827f57918dccb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC646 10108 bytes
font_01_sfnt_off0000dce4.bin
995fb28de13a9ea26fd01e7750c58e16a262ce8c85aaf6fb323cbb58a6e3c8a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 20312 bytes
font_02_sfnt_off00011144.bin
10e60ea6e51087ba46d55de607db985c7e62e0ae282d7b7d239fa019d6c6f0f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 2824 bytes
font_04_sfnt_off00013767.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13767 16792 bytes

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